面向对象的继承性是子类自动共享父类数据结构和方法的机制。
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My best friend, is a teacher, lives in Beling.
A. who
B. which
C. when
That's the apartment block my cousin lives.
A. when
B. that
C. where
These are the shoes I bought in the sales.
A. which
B. where
C. when
That's the teacher class I missed yesterday.
A. who
B. whom
C. whose
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